Citation:
ZHOU Yong-Guo, YANG Yue-Dong, GUO Xue-Min, QI Yin-Ge, BAI Ji-Hai. Preparation and Evaluation of Magnetic Targeting Drug Release Chitosan Microspheres Containing Aspirin[J]. Chinese Journal of Applied Chemistry,
;2002, 19(12): 1178-1182.
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Chitosan microspheres(CM) were prepared by cross-linking of glutaraldehyde with chitosan solution(mass fraction 10%), and coated with Fe3O4 to give magnetic chitosan microspheres(MCM). SEM, IR, atomic absorption spectrometry and UV results indicated that the size of the polymer particles became smaller (<1μm) and more uniformly distributed with decrease of the chitosan molecular weight. In vitro measurement showed the CM entrapped with Aspirin(CM-AS) released about 40% drug, while MCM-AS released 15% in period within one hour. The releasing times for 50% drug were 1.5 h and 5 h, respectively, for CM-AS and MCM-AS. Both MCM and MCM-AS showed strongly magnetic response and promizing applications as targeting drug releasing agent.
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